diff --git a/cmreslogging/handlers.py b/cmreslogging/handlers.py
index 7f6fb01..841ed90 100644
--- a/cmreslogging/handlers.py
+++ b/cmreslogging/handlers.py
@@ -79,6 +79,7 @@ class IndexNameFrequency(Enum):
     __LOGGING_FILTER_FIELDS = ['msecs',
                                'relativeCreated',
                                'levelno',
+                               'msg',
                                'created']
 
     @staticmethod